Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 181 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 35 × 79 = 2766 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 98 × 70 = 6852 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 20 = 660 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 680 + 291 = 977 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 613 + 265 = 878 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 83 × 82 = 6805 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 909 + 269 = 1183 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 136 + 661 = 797 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 76 × 17 = 1292 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 41 × 30 = 1233 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 28 × 54 = 1510 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 596 + 605 = 1194 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 70 = 6937 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 515 + 831 = 1346 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 57 × 76 = 4326 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 999 + 692 = 1691 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 59 × 58 = 3422 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 33 × 31 = 1023 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 79 × 98 = 7749 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 369 + 580 = 949 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 53 × 99 = 5247 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 29 × 48 = 1384 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 50 × 48 = 2400 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 19 × 89 = 1687 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 90 × 27 = 2437 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 916 + 680 = 1596 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 31 × 17 = 527 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 979 + 553 = 1537 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 39 × 25 = 966 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 23 × 53 = 1215 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 81 × 72 = 5834 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 63 × 13 = 819 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 192 + 945 = 1137 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 43 × 39 = 1677 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 63 × 45 = 2842 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 54 × 50 = 2700 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 109 + 196 = 312 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 218 + 794 = 1009 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 485 + 185 = 670 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 47 × 28 = 1311 right or wrong? (a) Right (b) Wrong

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